For a while I got periodic messages on YouTube telling me to move my account to Google Plus and to change the name. Ever since I made that change I can no longer login to YouTube. I get the following error message:

Which says "You are not eligible to create an account" and "Sorry, your login was incorrect".

This situation is very frustrating. I wish I never decided to change my YouTube account name! Does anyone here know how to fix this situation so that I can login to YouTube normally (like I could before the account name change).